<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var vm=new Vue({
            el:'#app',
            data:{
                val:"简单对象初始值",
                obj:{
                    name:"复杂对象name",
                    value:"复杂对象value",
                },
                watch:{
                    //watch监听器监听的值对应的函数的参数可加可不加,看需要
                    val:function(newval,oldval){
                        console.log(newval,oldval);
                        console.log(this.val)
                    },
                    //对于复杂对象监听方式
                    obj:{
                        deep:true,
                        handler:function(new_val,old_val){
                            console.log(new_val,old_val)
                        }
                    }
                }
            }
        })
    </script>
    
</body>
</html>